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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2010-2011, NVIDIA Corporation</span>
<a name="l00003"></a>00003 <span class="comment"> * All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions are met:</span>
<a name="l00007"></a>00007 <span class="comment"> *   * Redistributions of source code must retain the above copyright</span>
<a name="l00008"></a>00008 <span class="comment"> *     notice, this list of conditions and the following disclaimer.</span>
<a name="l00009"></a>00009 <span class="comment"> *   * Redistributions in binary form must reproduce the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> *     notice, this list of conditions and the following disclaimer in the</span>
<a name="l00011"></a>00011 <span class="comment"> *     documentation and/or other materials provided with the distribution.</span>
<a name="l00012"></a>00012 <span class="comment"> *   * Neither the name of NVIDIA Corporation nor the</span>
<a name="l00013"></a>00013 <span class="comment"> *     names of its contributors may be used to endorse or promote products</span>
<a name="l00014"></a>00014 <span class="comment"> *     derived from this software without specific prior written permission.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; AND</span>
<a name="l00017"></a>00017 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
<a name="l00018"></a>00018 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE</span>
<a name="l00019"></a>00019 <span class="comment"> * DISCLAIMED. IN NO EVENT SHALL &lt;COPYRIGHT HOLDER&gt; BE LIABLE FOR ANY</span>
<a name="l00020"></a>00020 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span>
<a name="l00021"></a>00021 <span class="comment"> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span>
<a name="l00022"></a>00022 <span class="comment"> * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND</span>
<a name="l00023"></a>00023 <span class="comment"> * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00024"></a>00024 <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00025"></a>00025 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00026"></a>00026 <span class="comment"> */</span>
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="preprocessor">#pragma once</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030 <span class="keyword">namespace </span>nih {
<a name="l00031"></a>00031 
<a name="l00032"></a><a class="code" href="classnih_1_1_sobol__sampler.html#ae85ae0890768f5c68bbccc3e03a8030e">00032</a> FORCE_INLINE NIH_HOST_DEVICE <a class="code" href="classnih_1_1_sobol__sampler.html#ae85ae0890768f5c68bbccc3e03a8030e">Sobol_sampler::Sobol_sampler</a>()
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034 <span class="preprocessor">#ifdef __CUDACC__</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span><span class="preprocessor">    #if (__CUDA_ARCH__ &gt; 0)</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span>    s_matrix = c_sobolMat;
<a name="l00037"></a>00037 <span class="preprocessor">    #else</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span>    s_matrix = s_sobolMat;
<a name="l00039"></a>00039 <span class="preprocessor">    #endif</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span>    s_matrix = s_sobolMat;
<a name="l00042"></a>00042 <span class="preprocessor">#endif</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span>}
<a name="l00044"></a>00044 
<a name="l00045"></a><a class="code" href="classnih_1_1_sobol__sampler.html#a092384171e44310586306f9ab3eb6bd4">00045</a> FORCE_INLINE NIH_HOST_DEVICE <a class="code" href="classnih_1_1_sobol__sampler.html#ae85ae0890768f5c68bbccc3e03a8030e">Sobol_sampler::Sobol_sampler</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> instance, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> s) : m_dim( unsigned int(-1) ), m_r(s), m_i(instance)
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 <span class="preprocessor">#ifdef __CUDACC__</span>
<a name="l00048"></a>00048 <span class="preprocessor"></span><span class="preprocessor">    #if (__CUDA_ARCH__ &gt; 0)</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span>    s_matrix = c_sobolMat;
<a name="l00050"></a>00050 <span class="preprocessor">    #else</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span>    s_matrix = s_sobolMat;
<a name="l00052"></a>00052 <span class="preprocessor">    #endif</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00054"></a>00054 <span class="preprocessor"></span>    s_matrix = s_sobolMat;
<a name="l00055"></a>00055 <span class="preprocessor">#endif</span>
<a name="l00056"></a>00056 <span class="preprocessor"></span>}
<a name="l00057"></a>00057 
<a name="l00058"></a><a class="code" href="classnih_1_1_sobol__sampler.html#a536af034afaf8959883dead62f862973">00058</a> FORCE_INLINE NIH_HOST_DEVICE <span class="keywordtype">float</span> <a class="code" href="classnih_1_1_sobol__sampler.html#a536af034afaf8959883dead62f862973">Sobol_sampler::sample</a>()
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060   next_dim();
<a name="l00061"></a>00061   <span class="keywordflow">return</span> float( sobol( m_i ) ) / float(UINT_MAX);
<a name="l00062"></a>00062 }
<a name="l00063"></a><a class="code" href="classnih_1_1_sobol__sampler.html#a4489c6a4fe29833a3591e86dc2c477e5">00063</a> FORCE_INLINE NIH_HOST_DEVICE <span class="keywordtype">float</span> <a class="code" href="classnih_1_1_sobol__sampler.html#a4489c6a4fe29833a3591e86dc2c477e5">Sobol_sampler::next</a>() { <span class="keywordflow">return</span> <a class="code" href="classnih_1_1_sobol__sampler.html#a536af034afaf8959883dead62f862973">sample</a>(); } <span class="comment">// random number generator interface</span>
<a name="l00064"></a>00064 
<a name="l00065"></a>00065 FORCE_INLINE NIH_HOST_DEVICE <span class="keywordtype">void</span> Sobol_sampler::next_dim()
<a name="l00066"></a>00066 {
<a name="l00067"></a>00067   ++m_dim;
<a name="l00068"></a>00068   m_r = m_r * 1103515245 + 12345;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 
<a name="l00071"></a>00071 FORCE_INLINE NIH_HOST_DEVICE 
<a name="l00072"></a>00072 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> Sobol_sampler::sobol( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i )
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m = (m_dim &amp; (sobolDims-1)) &lt;&lt; 5;
<a name="l00075"></a>00075   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> result = 0;
<a name="l00076"></a>00076 
<a name="l00077"></a>00077   <span class="keywordflow">for</span>( ; i; i &gt;&gt;= 1, ++m )
<a name="l00078"></a>00078     result ^= s_matrix[m <span class="comment">/*&amp; (sobolDims*32-1)*/</span>] * (i&amp;1);
<a name="l00079"></a>00079 
<a name="l00080"></a>00080   result ^= m_r;
<a name="l00081"></a>00081   <span class="keywordflow">return</span> result;
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083 
<a name="l00084"></a>00084 <span class="keyword">inline</span>
<a name="l00085"></a>00085 <span class="keywordtype">int</span> Sobol_sampler::generator_matrix(
<a name="l00086"></a>00086     <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> a,
<a name="l00087"></a>00087     <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> s,
<a name="l00088"></a>00088     <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> * <span class="keyword">const</span> m,
<a name="l00089"></a>00089     <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> * <span class="keyword">const</span> matrix, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> matrixSize)
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091     <span class="comment">// determine degree of polynomial (could be optimized using __builtin_clz)</span>
<a name="l00092"></a>00092     <span class="comment">//int s = 0;</span>
<a name="l00093"></a>00093     <span class="comment">//for (int p = a &gt;&gt; 1; p; p &gt;&gt;= 1, s++);</span>
<a name="l00094"></a>00094 
<a name="l00095"></a>00095     <span class="comment">// first columns correspond to m_1,...,m_s</span>
<a name="l00096"></a>00096     <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> k = 0; k &lt; s; ++k)
<a name="l00097"></a>00097         matrix[k] = m[k];
<a name="l00098"></a>00098 
<a name="l00099"></a>00099     <span class="comment">// the remaining direction numbers are obtained by recurrence</span>
<a name="l00100"></a>00100     <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> k = s; k &lt; matrixSize; k++) {
<a name="l00101"></a>00101         matrix[k] = (matrix[k - s] &lt;&lt; s) ^ matrix[k - s];
<a name="l00102"></a>00102         <span class="comment">// iterate over bits of polynomial</span>
<a name="l00103"></a>00103         <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = <span class="keywordtype">int</span>(s) - 1, p = a &gt;&gt; 1; i &gt; 0; i--, p &gt;&gt;= 1)
<a name="l00104"></a>00104         {
<a name="l00105"></a>00105             <span class="keywordflow">if</span> (p &amp; 1)
<a name="l00106"></a>00106                 matrix[k] ^= (matrix[k - i] &lt;&lt; i);
<a name="l00107"></a>00107         }
<a name="l00108"></a>00108     }
<a name="l00109"></a>00109     <span class="comment">// k-th column is the binary expansion of m_k / 2^k</span>
<a name="l00110"></a>00110     <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> k = 0; k &lt; matrixSize; k++)
<a name="l00111"></a>00111         matrix[k] &lt;&lt;= matrixSize - k - 1;
<a name="l00112"></a>00112 
<a name="l00113"></a>00113     <span class="keywordflow">return</span> s;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115 
<a name="l00116"></a>00116 } <span class="comment">// namespace nih</span>
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